The calculated distance (air line) between Al Bāb and Khān Shaykhūn is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Khān Shaykhūn is certainly longer, as only the direct route (as the crow flies) between Al Bāb and Khān Shaykhūn has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles